Pregnant women and those with kids agree on one thing — the main reason they fight with their spouse.

Both expecting and experienced mothers say whether to go back to work to earn more money for the family or deciding to stay at home is the No. 1 reason they argue with their spouses, according to a survey of over 600 pregnant women and 600 mothers of teenage children by personal finance site NerdWallet.com .

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A woman’s earnings decline by 30% after two to three years outside the workforce, according to the Institute for Women’s Policy Research, a research organization focusing on economic policy that impacts women. (It also found that women in the U.S. would not achieve equal pay until 2058, if current salary trends continue.)